package com.exam.interceptor;


import cn.hutool.http.HttpStatus;
import com.exam.context.UserUtils;
import com.exam.properties.JwtProperties;
import com.exam.properties.LogProperties;
import com.exam.util.JwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Cookie;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
@Order(1)
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    @Autowired
    private LogProperties logProperties;

    private String operation;

    /**
     * 校验jwt
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "*");
        if ("OPTIONS".equalsIgnoreCase((request).getMethod())){
            response.setStatus(HttpStatus.HTTP_OK);
            return true;
        }

        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = "";
        Cookie[] cookies = request.getCookies();

        if (cookies != null) {
            for (Cookie cookie : cookies) {
                String name = cookie.getName();  // 获取cookie的名称
                String value = cookie.getValue(); // 获取cookie的值
                if ("token".equals(name)) {
                    token = value;
                }
            }
        }

        //2、校验令牌
        try {
            JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);

            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401); //要更新token令牌
            return false;
        }
    }


}
